ST1938 Datasheet, PDF (1/5 Pages) Stanson Technology – DC-DC Step-Up Converter for White LED Driver

ST1938
DC-DC Step-Up Converter for White LED Driver
DESCRIPTION
The ST1938 is a step-up DC/DC converter for white LED driver with over voltage protection.
The device can driver one to four LEDs in series from a single cell Lithium Ion battery.
Internal functions include current limiting; thermal shutdown; OVP and soft-start to prevent
damage operate status. The ST1938 operates at 0.8MHz and from low input voltages as low as
1.5V; apply to Lithium-Ion powered systems. A low 95mV reference voltage minimizes power
loss in the current setting resistor for better efficiency.
The ST1938 is available in small package SOT-23-6L
PIN CONFIGURATION
SOT23-6L
APPLICATIONS
z Battery Power Equipment
z Notebook Computers
z PDA
z Cellular Phone
PART MARKING
FEATURES
z Current Source with Over Voltage
Protection
z Fast 0.8MHz Switching Frequency
z High Efficiency up to 87%
z Drives up to Four LEDs From 3.2V
Supply
z Drives up to Six LEDs From a 5V Supply
z Low Quiescent Current
z Disconnects LEDs in Shutdown Mode
z Internal Over Temperature and Current
Limiting Shutdown Function
z Internal Soft-Start Circuit
z 36V Rugged Bipolar Switch
z Available in a Small SOT-23-6L Package
STANSON TECHNOLOGY
120 Bentley Square, Mountain View, Ca 94040 USA
www.stansontech.com
ST1938 2008. V1